56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
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/*
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* Helper functions for treating node Buffer instances as C "pointers".
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*/
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#include "v8.h"
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#include "nan.h"
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#include "node_buffer.h"
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/*
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* Called when the "pointer" is garbage collected.
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*/
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inline static void wrap_pointer_cb(char *data, void *hint) {
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//fprintf(stderr, "wrap_pointer_cb\n");
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}
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/*
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* Wraps "ptr" into a new SlowBuffer instance with size "length".
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*/
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inline static Nan::MaybeLocal<v8::Object> WrapPointer(void *ptr, size_t length) {
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void *user_data = NULL;
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return Nan::NewBuffer((char *)ptr, length, wrap_pointer_cb, user_data);
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}
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/*
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* Wraps "ptr" into a new SlowBuffer instance with length 0.
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*/
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inline static Nan::MaybeLocal<v8::Object> WrapPointer(void *ptr) {
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return WrapPointer((char *)ptr, 0);
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}
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/*
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* Unwraps Buffer instance "buffer" to a C `char *` with the offset specified.
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*/
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inline static char * UnwrapPointer(v8::Handle<v8::Value> buffer, int64_t offset = 0) {
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if (node::Buffer::HasInstance(buffer)) {
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return node::Buffer::Data(buffer.As<v8::Object>()) + offset;
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} else {
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return NULL;
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}
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}
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/**
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* Templated version of UnwrapPointer that does a reinterpret_cast() on the
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* pointer before returning it.
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*/
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template <typename Type>
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inline static Type UnwrapPointer(v8::Handle<v8::Value> buffer) {
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return reinterpret_cast<Type>(UnwrapPointer(buffer));
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}
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